Electromagnetism: Understanding Magnetic Forces and Fields - Prof. Timothy H. Farris, Study notes of Physics

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30.3 Ampere's Law

Consider a loop of B field around a wire:

Ampere's Law

where I is the current surrounded or enclosed by the path of

integration.

We can apply Ampere's law to find magnetic fields in some

cases. For example, the field around a wire:

Example: Suppose you want a 1.00T field inside a coil in an

MRI machine that's 0.800 m long & consists of 50,000 turns

of wire. What current is required?

30.5 Magnetic Flux

Just like the electric flux, we can define themagnetic flux, Φ

, as the # of B field lines going through an area.

Units of flux:

[ Φ ] = T∙ m² = weber (Wb)

30.7 Displacement Current and the General Form of

Ampere's Law

Consider charging

the capacitor at the

right.

There is something else happening here that is not

accounted for in Ampere's law; Ampere's in not complete

• Ch 30: pp
• P 17, 23, 33, 34,